[vcpkg-tool-meson] build failure about vcpkg

[Neumann-A]

opened #37768 to reorder the code and put the download before the version check of python.

[Osyotr]

Maybe #37585?

[Cazadorro]

No idea, hopefully, but I personally can't test this anymore since I found out that libsystemd is irrevocably broken with centos 7 because it requires a higher kernel version headers, and older versions don't exist in vcpkg, meaning I have to stick with older versions of vcpkg anyway. OpenCV now cannot work on Centos 7/Redhat 7 since libsystemd's introduction to vcpkg 6 months ago.

[Osyotr]

No idea, hopefully, but I personally can't test this anymore since I found out that libsystemd is irrevocably broken with centos 7 because it requires a higher kernel version headers, and older versions don't exist in vcpkg, meaning I have to stick with older versions of vcpkg anyway. OpenCV now cannot work on Centos 7/Redhat 7 since libsystemd's introduction to vcpkg 6 months ago.

How did it work before? Maybe create empty overlay for libsystemd (and probably libmount)?

[Cazadorro]

It simply wasn't a vcpkg dependency before, I assume it used the system version of libsystemd if it was required at all.

[dg0yt]

-- Found Python version '3.8.13 at /opt/rh/rh-python38/root/usr/bin/python3'

Is this recent enough for meson?

OpenCV now cannot work on Centos 7/Redhat 7 since libsystemd's introduction to vcpkg 6 months ago.

I warned about side effects...
But you can replace the vcpkg port with an empty overlay port.

[Neumann-A]

@BillyONeal Do I need to include the vcpkg-port-config.cmake in the portfile of the installing port to make --only-downloads work?

[dg0yt]

Do I need to include the vcpkg-port-config.cmake in the portfile of the installing port to make --only-downloads work?

AFAICT You need "to make --only-downloads work". This means to invoke code for downloading.

I guess the current version stops at

vcpkg_execute_required_process(COMMAND "${PYTHON3}" --version
            WORKING_DIRECTORY "${CURRENT_BUILDTREES_DIR}"
            LOGNAME "python3-version-${TARGET_TRIPLET}")

[BillyONeal]

Yeah, it seems like that could get ALLOW_IN_DOWNLOAD_MODE